LEDs the Fast-Rising Heroes of Efficiency

Light-emitting diodes, or LEDs, once were the stuff of electronics geeks rifling through circuit board component drawers at Radio Shack. They were the blinking lights on computers and stereo systems signifying that the power was on, and the soft red glow of a calculator display back when President Jimmy Carter was putting solar panels on the White House. Today, LEDs are the rising heroes of energy efficiency around the world.